Am Sonntag, 1. Juli 2007 schrieb Matthew Dharm:
> On Sun, Jul 01, 2007 at 11:00:43AM +0200, Oliver Neukum wrote:
> > My goals are:
> >
> > - guarantee the storage driver a fallback path without memory allocation
>
> What about avoiding allocation of memory during a usb-storage transfer
> completely?
IIRC Alan computed the worst case memory requirements and for
permanently allocated memory it was bad.
> Does anyone know if the SCSI core actually follows the sg_tablesize
> parameter in the struct scsi_host_template ? Right now, it's set to
> SG_ALL, which means "unlimited number of sg elements", but any other
> non-zero value is supposed to be the maximum number of segments that the
> SCSI core sends to usb-storage.
It seems to me that this is the key parameter determining the throughput
of the storage driver.
Regards
Oliver
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